Description
Vehicle Compatibility & OE Cross Reference
This Lucas AS123 style 12V alternator rectifier is designed for agricultural, industrial and 4x4 applications where the original rectifier matches the same 115 mm diameter, 6-diode layout and OE numbers listed below. It is commonly used on Case IH, Ford, JCB, Land Rover, Massey Ferguson, Renault and Rover applications.
OE Numbers by Brand
- Case IH: K262267
- Ford: E7NN-10304AA; E7NN10304AA
- JCB: 71410805
- Land Rover / Rover: BAU4920; BAU5266; BAU5813; RTC5045
- Massey Ferguson: 1897700M91; 3474648M91; 347468M91; 3477529M91
- Renault: 5430021884
- Cross reference (Mobiletron): RL-01H
- Other suppliers: RCT4015 and equivalent Lucas AS123 rectifier references
If your original rectifier carries any of these OE or comparison numbers and measures approximately 115 mm in outer diameter with 6 diodes, RCT4015 is a suitable replacement option for the matching Lucas AS123 alternator.
Specifications
- Reference: RCT4015
- Part type: Alternator rectifier
- Alternator family: Lucas AS123 type
- System voltage: 12V
- Outer diameter: 115 mm
- Number of diodes: 6
- Current capacity: from 35 A
- OE coverage: Case IH, Ford, JCB, Land Rover, Massey Ferguson, Renault, Rover (as per OE list)
- Comparison number: Mobiletron RL-01H
- Function: Rectifies alternator AC output to DC to charge the battery and supply the electrical system
Features
- Rectifier 12V 115 mm 6 diode design for Lucas AS123 style alternators
- From 35 A current rating for reliable charging on agricultural and industrial engines
- Wide OE cross reference covering Case IH, Ford, JCB, Land Rover, Massey Ferguson, Renault and Rover
- Direct replacement footprint to simplify alternator overhaul and in-field repairs
- Helps restore proper charging performance where the original rectifier has failed, shorted or gone open circuit
Why Buy From Us
- Local stock on key Lucas AS123 rectifiers like RCT4015 to minimise downtime
- Standard 12 month warranty under normal operating and installation conditions
- Fitment assistance using OE numbers, alternator labels and photos
- Secure online ordering with reliable nationwide courier delivery
- Trusted by workshops, farmers and fleet operators for durable charging system components
Installation & Maintenance Tips
- Disconnect the battery before removing the alternator or working on the rectifier.
- Confirm alternator model, OE number and rectifier diameter (115 mm) before fitting RCT4015.
- Inspect stator windings, slip rings and brushes for heat damage or short circuits when replacing a failed rectifier.
- Ensure all main power and earth connections are clean and tight to prevent voltage drop and repeat failures.
- After reassembly, bench test the alternator or check charging voltage on the vehicle to confirm correct operation.
- If you are unsure about alternator repairs, have the rectifier fitted and tested by a qualified auto electrician.
Important: Product information, kit contents and compatibility are provided as a guide and may contain errors or omissions. Please verify that this part and any included components are correct for your vehicle before installation. For full details see our Website Disclaimer (Errors & Omissions).